Dynamo-electric machine.



M. A. SAVAGE. nYNAMo ELECTRIC MAcH|NE.`

APPLICATION FILED )UNE 24.19l3.

Patented Apr. 13, 1915.

yA/tmxesses:

l UNITED STA PATENT OFFICE;

Mmmm A. comme, or eonmc'rwv, Newxonx. Assxeivon To rfemminili; mesmo ACOMPANY, ecorommoiy on New Yoejx.

- nYNAMo-Eeecmnzc Memer. VILB Specification@ Letters Patent.

Patented Apr. 13., 1915.

' nonnen mea June u, 191s, seria: m. 775.480. 4

because of the high centrifugal strains to- Which 'it is subjected.Such. 'o rotatable,

member becomes the feature of a bi'ghespee generator'beceuse of thedifiicult of keeping it cool. l f

L yminventicn has for its object a novel construction and arrangement of'parte whereby auch o.' rotatable member, or: any rotating member of adynamo electric mechine, meybek'ept cool in e eimple uml effec "For e,better undexistending of 'icy invention refeencc may behad yto thefollowing description taken in connection with the ec compenying rawing,in which the single figure is e creeesectional View' of e dynamo yelectric machineemboclying my invention.

In the dawing, Ilmye illustrated my 'mventicn in connection with' enalternating current machine, having e'stationary and e rotatable member.r'he stationary member comprises e coi-e 1 having slots' in its inner'periphery in Whicb'cre place@ windings 2. The rotatable member comprisesa. core 3 having windings 4 in slots in 'its outer pe riphery. This.Winding is supplied with ex# citation through collector rings '5, whichare suitably -cormected to the windings,v 4. The rotatable member, ismounted in bearinge, one of which is shown e136. andimay be connected too pz'imery's'ource ofgpower such as a turbine tbroug'lzc coupling 7.

In accordance with myfinvention, the core" f 3 of `the yrotatable memberis providedI with ai duct extenling axially from one enel of said memberinto but notthrougb the seme, seid deci', being shown in the form' of ecevity '8 with 'an opening 10 to the cavity from one emi of the core.,the opening 10 being concentric with the axis ci rotation of the States,residing et and scope of my invention.

coi'e. Through substcntielly tbe center of this opening a pipe 9 cieinellei diameter than the open end of e-:iiil duct extends foiconveying cooling fluid ieee the cavity. Preferably, this pipe' extendssubstantially to tbe closed end of the cavity. The open ing 10 ispreferably of less diametery than n the cavity. A discharge pipe l1 maybe 'provided et the enel o f the openig 10, and as shown, may besuitably ackccl to prevent the escape of cooling 4fluid from the junc-.c com* tion of the opening 10' and the dischan'ge f pipe 1l. I haveshown the core as being divided moo two parte,y the cavity being'.formed in one part and the other' forming the closure for the cavity.The two 'parte .have aL shrink fit in order to prevent the es- Y "capeof any of the cooing fluid; They also may be held together by the bolts12.

The rotetable member is cooled by supply# mg cooling Huid, such asWater,l to the pipe i "9 by which it is conveyed intowthe cavity 8W Asthe water becomes heated by coming into v contact with the core, itsspecific gravi@ 1B i. V

decreaeed,' and centrifugal forcerepleoes# by cold Weterrfrom the pipe9, since water has 'e higher specific gravity. 1x1-this wey, the-hemftevzl water occupies the control portion of the-cavity andlows 'oithrough the opening 10 and the di'scherge'pipe 11.

have shoxvnthe'stationary member-s' being cooled in a well known mannerby means of air. Cool air is teken into thema,-

- chine 'through its base 13 and is forced into the air gap between thestationary and ro tetable members by means of fans 14 mountf ed on theendsof the core. The air then passes through ducts 15 in the core 1 ofthe stationary member, into passages 16 about the core 1, and out of themachine through 'an exit 'l Y I desire it to be understood that myinvention is not limited'v to the particular construction shown anddescribed and Iaim in the appende claims to covery allmodificationewhiclido not depart from the spirit member being formedWithe cooling duct y* Y extending axially from one end of said memberinto-but not through the same, a

pipe of smaller diameter than the duct at Il itsopen end extendingthrough Substantially the center of the opening, whereby a coolingirndsupplied to said pipe wilt flow through :the-same into sa-idduct andout again through the opening about said pipe.

2. In a dynamo electric machine, a rota I table, member havingwindingsthereomsaid vir'i'ember Ubeing formed with a Acooling duct extendingaxially from` one Vend of saidl member into but not through the same, apipe of smaller diameter than the duct at its open 'end extendingthrough substantially the center of the opening, and a ischarge pipe for`the open end of the duct. whereby a cooling fiuid suppiied to said pipewill f'ow4 through the same intovsaid duct and cavity for conveyingcooling Huid into said cavity, 4said fluid -after cooling said coreowing off through said opening in said' core about said pipe.

p 4.111- a dynamo electric machine, a rotay table, member, comprising acore and wind-' ings' thereon, said core having a cavity vtherein andanopening to the cavity from one end of said core, said opening being'concentric with the axis of rotation of saidl core, and a pipeextending through substantially the center'of said opening and into saidcavity substantially to the closed end thereof for conveying coolingfiuid into said cavity, said fluid after cooling said core iowingofiithrough said opening in said core about said pipe. Y

In a dynamo electric machineLa rotatable member comprising :i core andwindings thereon, said core heffing u cavity there in and` an opening'to the cavity from one end of said core, fsaid opening being con?centric with the axis of said core '-1 pipe er* tending throughsubstantially the renter of said opening and into said cavity for connveying cooling fluid into said cavity, and. a discharge pipe for saidopening in the core, said iuid after cooiing said corev iowing offthrough saidopening in said core and then through said discharge pipe.

6. n a dynamo electric machine, a rotatable member comprising a core andwind ings thereon, said core having a cavity therein and an openlng tothe cavity from one end of said core. said opening heinglof iessdiameter than said cavity, `said opening being concentric with the axisof rotationof said core, a pipe extending through substan.`

tialiy the center of said opening and into said cavity substantially tothe closed end thereqf'for conveying cooling Huid into said cavity:4and-a dischargepipe for said open.- mg 1n the core. said fluid aftercooling said core flowing oi through said opening 1n said i core andthen through said'dischargepipe. In Witness whereof, Iy have hereuntoset my hand this '23rd day' of June, 1913. l

. MARION A. SAVAGE.

Witnesses BENJAMIN B. HULL, HELEN Onronn.

